Komatsu D155AX-8 Dozer - page 4

PERFORMANCE FEATURES
KOMATSU NEW ENGINE TECHNOLOGIES
New Tier 4 Final Engine
The Komatsu SAA6D140E-7 engine is EPA Tier 4 Final
emissions certified and provides exceptional performance
while reducing fuel consumption. Based on Komatsu
proprietary technologies developed over many years, this new
diesel engine reduces nitrogen oxides (NOx) by more than
80% when compared to Tier 4 interim levels. Through the
in-house development and production of engines, electronics,
and hydraulic components, Komatsu has achieved great
advancements in technology, providing high levels of
performance and efficiency in virtually all applications.
Heavy-duty cooled Exhaust Gas Recirculation
(EGR) system
The system recirculates a portion of exhaust gas into the air
intake and lowers combustion temperatures, thereby
reducing NOx emissions.
EGR gas flow has been
decreased for Tier 4 Final
with the addition of SCR
technology. The system
achieves a dynamic
reduction of NOx, while
helping reduce fuel consumption
below Tier 4 Interim levels.
Technologies Applied to New Engine
Heavy-duty aftertreatment system
This new system combines a Komatsu Diesel Particulate
Filter (KDPF) and Selective Catalytic Reduction (SCR). The
SCR NOx reduction system injects the correct amount of
DEF at the proper rate, thereby decomposing NOx into
non-toxic water (H
2
O) and nitrogen gas (N
2
).
Advanced Electronic Control System
The electronic control system performs high-speed
processing of all signals from sensors installed in the vehicle
providing total control of equipment in all conditions of use.
Engine condition information is displayed via an on-board
network to the monitor inside the cab, providing necessary
information to the operator. Additionally, managing the infor-
mation via KOMTRAX helps customers keep up with
required maintenance.
Komatsu Variable Geometry Turbocharger (KVGT)
system
The KVGT system features proven Komatsu design hydraulic
technology for variable control of air-flow and supplies
optimal air according to load conditions. The upgraded
version provides better exhaust temperature management.
KDPF
DEF mixing tube
Clean exhaust
Ammonia oxidation catalyst
Second selective reduction
catalyst for NOx
First selective reduction catalyst for NOx
Cooled
EGR
KCCV
KDPF
HPCR
SCR
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